Merge branch 'develop'

doc/changes.qbk

@@ -54,7 +54,7 @@ First official release.
   Document that the equality and inequality operators are undefined for two
   objects if their equality predicates aren't equivalent. Thanks to Daniel
   Krügler.
-* [@https://svn.boost.org/trac/boost/ticket/1710 Ticket 1710]: 
+* [@https://svn.boost.org/trac/boost/ticket/1710 Ticket 1710]:
   Use a larger prime number list. Thanks to Thorsten Ottosen and Hervé
   Brönnimann.
 * Use
@@ -107,7 +107,7 @@ First official release.
 
 * Buckets are allocated lazily which means that constructing an empty container
   will not allocate any memory.
-  
+
 [h2 Boost 1.42.0]
 
 * Support instantiating the containers with incomplete value types.
@@ -327,4 +327,34 @@ C++11 support has resulted in some breaking changes:
 * Simpler move construction implementation.
 * Documentation fixes ([pull_request 6]).
 
+[h2 Boost 1.67.0]
+
+* Improved C++17 support:
+  * Add template deduction guides from the standard.
+  * Use a simple implementation of `optional` in node handles, so
+    that they're closer to the standard.
+  * Add missing `noexcept` specifications to `swap`, `operator=`
+    and node handles, and change the implementation to match.
+    Using `std::allocator_traits::is_always_equal`, or our own
+    implementation when not available, and
+    `boost::is_nothrow_swappable` in the implementation.
+* Improved C++20 support:
+  * Use `boost::to_address`, which has the proposed C++20 semantics,
+    rather than the old custom implementation.
+* Add `element_type` to iterators, so that `std::pointer_traits`
+  will work.
+* Use `std::piecewise_construct` on recent versions of Visual C++,
+  and other uses of the Dinkumware standard library,
+  now using Boost.Predef to check compiler and library versions.
+* Use `std::iterator_traits` rather than the boost iterator traits
+  in order to remove dependency on Boost.Iterator.
+* Remove iterators' inheritance from `std::iterator`, which is
+  deprecated in C++17, thanks to Daniela Engert
+  ([@https://github.com/boostorg/unordered/pull/7 PR#7]).
+* Stop using `BOOST_DEDUCED_TYPENAME`.
+* Update some Boost include paths.
+* Rename some internal methods, and variables.
+* Various testing improvements.
+* Miscellaneous internal changes.
+
 [endsect]

include/boost/unordered/detail/implementation.hpp

@@ -965,7 +965,7 @@ namespace boost {
 #endif
 
 ////////////////////////////////////////////////////////////////////////////
-// TRAITS TYPE DEDETION MECHANISM
+// TRAITS TYPE DETECTION MECHANISM
 //
 // Used to implement traits that use a type if present, or a
 // default otherwise.